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Eclipse-class second-class protected cruisers were preceded by the shorter Astraea-class cruisers. Eclipse had a displacement of 5,600 long tons (5,700 t; 6,300 short tons) when at normal load. It had a total length of 373 ft (114 m), a beam of 53 ft 6 in (16.31 m), a metacentric height of around 3 m (9 ft 10 in), and a draught of 20 ft 6 in (6.25 m).[1] It was powered by two inverted triple-expansion steam engines which used steam from eight cylindrical boilers. Using normal draught, the boilers were intended to provide the engines with enough steam to generate 8,000 indicated horsepower (6,000 kW) and to reach a speed of 18.5 knots (34.3 km/h; 21.3 mph); using forced draft, the equivalent figures were 9,600 indicated horsepower (7,200 kW) and a speed of 19.5 knots (36.1 km/h; 22.4 mph). Eclipse-class cruisers carried a maximum of 1,075 long tons (1,092 t) of coal and achieved maximum speed of 20 knots (37 km/h; 23 mph) in sea trials.[2]

It carried five 40-calibre6-inch (152 mm)quick-firing (QF) guns in single mounts protected by gun shields. One gun was mounted on the forecastle, two on the quarterdeck and one pair was abreast the bridge.[3] They fired 100-pound (45 kg) shells at a muzzle velocity of 2,205 ft/s (672 m/s).[4] The secondary armament consisted of six 40-calibre 4.7-inch (120 mm) guns; three on each broadside. Their 45-pound (20.4 kg) shells were fired at a muzzle velocity of 2,125 ft/s (648 m/s).[5] It was fitted with three 18-inchtorpedo tubes, one submerged tube on each broadside and one above water in the stern.[6] Its ammunition supply consisted of 200 six-inch rounds per gun, 250 shells for each 4.7-inch gun, 300 rounds per gun for the 76 mm (3.0 in)s and 500 for each three-pounder. Eclipse had ten torpedoes, presumably four for each broadside tube and two for the stern tube.[7]

On the outbreak of the First World War she formed part of the 12th Cruiser Squadron, which patrolled at the Western end of the English Channel, with particular duties to stop suspicious vessels and prevent disguised minelayers from interfering with cross-Channel traffic.[10][11]